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uprobes: Use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem 

Use DEFINE_STATIC_PERCPU_RWSEM() to initialize dup_mmap_sem.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Oleg Nesterov 2019-04-23 17:21:02 +02:00 committed by Paul E. McKenney
parent 95bf33b55f
commit 2bf1acc299
1 changed files with 1 additions and 3 deletions
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4
kernel/events/uprobes.c
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@ -46,7 +46,7 @@ static DEFINE_SPINLOCK(uprobes_treelock); /* serialize rbtree access */
static struct mutex uprobes_mmap_mutex[UPROBES_HASH_SZ]; static struct mutex uprobes_mmap_mutex[UPROBES_HASH_SZ];
#define uprobes_mmap_hash(v) (&uprobes_mmap_mutex[((unsigned long)(v)) % UPROBES_HASH_SZ]) #define uprobes_mmap_hash(v) (&uprobes_mmap_mutex[((unsigned long)(v)) % UPROBES_HASH_SZ])
static struct percpu_rw_semaphore dup_mmap_sem; DEFINE_STATIC_PERCPU_RWSEM(dup_mmap_sem);
/* Have a copy of original instruction */ /* Have a copy of original instruction */
#define UPROBE_COPY_INSN 0 #define UPROBE_COPY_INSN 0
@ -2302,7 +2302,5 @@ void __init uprobes_init(void)
for (i = 0; i < UPROBES_HASH_SZ; i++) for (i = 0; i < UPROBES_HASH_SZ; i++)
mutex_init(&uprobes_mmap_mutex[i]); mutex_init(&uprobes_mmap_mutex[i]);
BUG_ON(percpu_init_rwsem(&dup_mmap_sem));
BUG_ON(register_die_notifier(&uprobe_exception_nb)); BUG_ON(register_die_notifier(&uprobe_exception_nb));
} }